0
TECHNICAL PAPERS: Internal Combustion Engines

Laser Ignition of Methane-Air Mixtures at High Pressures and Diagnostics

[+] Author and Article Information
Herbert Kopecek, Soren Charareh, Martin Weinrotter, Ernst Wintner

Technische Universität Wien, Institut für Photonik, Gusshausstrasse 27/387, A1040 Wien, Austria

Maximilian Lackner, Christian Forsich, Franz Winter

Vienna University of Technology, Institute of Chemical Engineering, Getreidemarkt 9/166, A1060 Wien, Austria

Johann Klausner, Günther Herdin

GE Jenbacher, A6200 Jenbach, Austria

J. Eng. Gas Turbines Power 127(1), 213-219 (Feb 09, 2005) (7 pages) doi:10.1115/1.1805550 History: Received July 15, 2003; Revised March 12, 2004; Online February 09, 2005
Copyright © 2005 by ASME
Your Session has timed out. Please sign back in to continue.

References

Ronney,  P. D., 1994, “Laser Versus Conventional Ignition of Flames,” Opt. Eng., 33(2), pp. 510–520.
Forch,  B. E., and Miziolek,  A. W., 1991, “Laser-Based Ignition of H2/O2 and D2/O2 Premixed Gases Through Resonant Multiphoton Excitation of H and D Atoms Near 243 nm,” Combust. Flame, 85, pp. 254–262.
Morsy,  M. H., Ko,  Y. S., and Chung,  S. H., 1999, “Laser-Induced Ignition Using a Conical Cavity in CH4-Air Mixtures,” Combust. Flame, 119, pp. 473–482.
Heitzmann,  T., and Wolfrum,  J., 1995, “Experimental and Modeling Studies on the Ignition of CH3OH/O2-Mixtures With a CO2-Laser System,” Z. Phys. Chem. (Munich), 188, pp. 177–196.
Yablonovich,  E., 1974, “Self Phase Modulation of Light in a Laser Breakdown Plasma,” Phys. Rev. Lett., 32, pp. 1101–1104.
Yablonovich,  E., 1975, “Self Phase Modulation and Short Pulse Generation From Laser Breakdown Plasmas,” Phys. Rev. A, 10, pp. 1888–1895.
Rüdisser, D., 2002, “Raum- und zeitaufgelöste optische Diagnostik Laser-gezündeter Gasgemische mit planarer Laser-induzierter Fluoreszenz,” diploma thesis, Graz University of Technology, Graz.
Spiglanin,  T. A., Mcilroy,  A., Fournier,  E. W., Cohen,  R. B., and Syage,  J. A., 1995, “Time-Resolved Imaging of Flame Kernels: Laser Spark Ignition of H2/O2/Ar Mixtures,” Combust. Flame, 102, pp. 310–328.
Chen,  Y. L., and Lewis,  J. W. L., 2001, “Visualization of Laser-Induced Breakdown and Ignition,” Opt. Express,9, pp. 360–372.
Weinberg,  F. J., and Wilson,  J. R., 1971, “A Preliminary Investigation of the use of Focused Beams for Minimum Ignition Energy Studies,” Proc. R. Soc. London, Ser. A, 321, pp. 41–52.
Ma, J. X., Ryan, T. W., and Buckingham, J. P., 1998, “Nd:YAG Laser Ignition of Natural Gas,” ASME, ICE 30-3, Paper No. 98-ICE–114.
Raffel,  B., and Wolfrum,  J., 1986, “Infrared Laser Induced Ignition of Gas Mixtures,” Ber. Bunsenges. Phys. Chem., 90, pp. 997–1001.
Lackner,  M., Forsich,  Ch., Winter,  F., Kopecek,  H., and Wintner,  E., 2003, “In Situ Investigation of Laser-Induced Ignition and the Early Stages of Methane-Air Combustion at High Pressures Using a Rapidly Tuned Diode Laser at 2.55 μm,” Spectrochim. Acta, 59(13), pp. 2997–3018.
Kopecek, H., Wintner, E., Pischinger, H., Herdin, G., Klausner, J., and Jenbacher A. G., 2000, “Basics for a Future Laser Ignition System for Gas Engines,” Fall Technical Conference ASME, Preoria, US, ICE-35-2, Paper No. 2000-ICE-316.
Kopecek,  H., Maier,  H., Reider,  G., Winter,  F., and Wintner,  E., 2003, “Laser Ignition of Methane-Air Mixtures at High Pressures,” Exp. Therm. Fluid Sci., 27, pp. 499–503.

Figures

Grahic Jump Location
Scope of timescales of various processes involved in laser-induced ignition. The lengths of the double-arrowed lines indicate the duration ranges of the indicated processes. Inserts: typical laser pulse duration; examples for temporal development of spatially resolved OH concentrations in flame kernels 7; typical pressure rise in the combustion chamber.
Grahic Jump Location
Experimental setup for evaluation of ignition parameters: 1—Nd:YAG-Laser; 2—beam attenuator; 3,4,5—beam sampler (4%); 6—concave lens f=−40 mm; 7—spherical corrected convex lens f=60 mm; 8,9—InGaAS PIN detector; 10,11—pyroelectric detector; 12—laser energy measuring unit; 13—pressure detector; 14—charge amplifier; 15—digital storage oscilloscope; 16—fast digital storage oscilloscope; 17—combustion chamber; 18—aperture 1 mm
Grahic Jump Location
Experiment setup for ignition diagnostics: 1—diagnostic diode laser at 2.55 μm; 2—temperature controller; 3—laser driver; 4—function generator; 5—detector; 6—amplifier; 7—PC; 8—oscilloscope; 9, 10—boxes purged with N2; 11—pressurized combustion vessel; 12—Nd:YAG laser; 13—fuel and air inlet; 14—exhaust gas analysis
Grahic Jump Location
Minimum pulse energy needed for ignition versus air/fuel-equivalence ratio λ; methane-air mixtures, T=200 °C, fill pressure 30 bar
Grahic Jump Location
Transmitted laser energy through plasma versus air/fuel-equivalence ratio λ; methane-air mixtures, T=200 °C, fill pressure 30 bar
Grahic Jump Location
Pressure rise in the chamber after ignition applying minimum pulse energy; methane-air mixtures, T=200 °C, fill pressure=30 bar, laser pulse energy=25 mJ
Grahic Jump Location
Ignition delay versus air/fuel-equivalence ratio at minimum laser pulse energy; methane-air mixtures, T=200 °C, fill pressure 30 bar
Grahic Jump Location
Temporal shapes of the focal intensity of transmitted pulses through the medium with or without plasma formation. Depending on the input laser pulse energy, plasma is formed if the breakthrough intensity is exceeded, thereby drastically changing the transmitted pulse shape; air of technical purity, T=20 °C, fill pressure 40 bar.
Grahic Jump Location
Temporal shapes of the focal intensity of transmitted pulses under reliable plasma formation condition, depending on different gaseous media (technical purity); T=20 °C, fill pressure 10 bar
Grahic Jump Location
Evaluated data from the laser-induced ignition of a stoichiometric methane/air mixture, namely, gas inhomogeneity index, water absorbance, and flame emission. T=200 °C, fill pressure 30 bar, air/fuel-equivalence ratio λ=1.0
Grahic Jump Location
Evaluated data from the laser-induced ignition of a fuel-lean methane/air mixture, namely, gas inhomogeneity index, water absorbance, and flame emission. T=200 °C, fill pressure 30 bar, air/fuel-equivalence ratio λ=1.7
Grahic Jump Location
Pressure rise in a laser-ignited cylinder depending on laser pulse energy; 1 MW natural gas engine, mean pressure 18 bar, time of ignition 20° before DTC, NOx=500 mg/mN3, averaged over 100 cycles
Grahic Jump Location
Required laser pulse energy of a laser-ignited cylinder depending on mean pressure; 1 MW gas engine, air/fuel-equivalence ratio λ=1.8

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In